/*
 * Copyright (C) 2015 MarkMjw
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hashcoding.eyes.ui.protocol;

import android.widget.AbsListView;

/**
 * ScrollListener for AbsListView.
 *
 * @author markmjw
 * @date 2015-04-26
 */
public abstract class IScrollListener implements AbsListView.OnScrollListener {

    protected boolean mScrollLoadEnable = false;

    public abstract void onLoadMore();

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        if (AbsListView.OnScrollListener.SCROLL_STATE_IDLE == scrollState && mScrollLoadEnable) {
            onLoadMore();
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
                         int totalItemCount) {
        boolean canLoadMore = firstVisibleItem + visibleItemCount >= totalItemCount;
        mScrollLoadEnable = canLoadMore && firstVisibleItem > 0;
    }

}